kbuild: m68k,parisc,ppc,ppc64,s390,xtensa use generic asm-offsets.h support

Delete obsoleted parts form arch makefiles and rename to asm-offsets.h

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/include/asm-ia64/ptrace.h b/include/asm-ia64/ptrace.h
index 0bef195..c8766de 100644
--- a/include/asm-ia64/ptrace.h
+++ b/include/asm-ia64/ptrace.h
@@ -57,7 +57,7 @@
 #include <linux/config.h>
 
 #include <asm/fpu.h>
-#include <asm/offsets.h>
+#include <asm/asm-offsets.h>
 
 /*
  * Base-2 logarithm of number of pages to allocate per task structure